sample of n=5 scores has M-20 and s2 =4. What is the sample standard deviation?

What is the sample standard deviation?

mean = 71 kg, standard deviation = 13 kg, If 46 adults are randomly selected, what is the probability that the sample mean would be greater than 72.8 kg?

Accordi the historical data, the life expectancy in Mexico is equal to the life expectancy in Spain. A new study has been made to see whether this has changea. Records of 205 individuals from Mexico who died recently are selected at random. The 205 individuals lived an average of 71.8 years with a standard deviation of 2.6 years. Records of 250 individuals from Spain who died recently are selected at random and independently. The 250 individuals lived an average of 71.2 years with a standard deviation of 3.0 years. Assume that the population standard deviation of the life expectancy can be estimated by the sample standard deviations, since the samples that are used to compute them are quite large. At the 0.05 level of significance, is there enough evidence to support the claim that the life expectancy, H1, in Mexico is not equal to the life expectancy, µ,, in Spain anymore? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to at least three…

Mathematics scores on the CBBC standardized exam are normally distributed with a population mean of 164 and a population standard deviation of 12. Ms. Norbury believes her two classes of a total of 48 students have a mathematics comprehension different than 164 and she decides to give her classes the exam. The mean on the exam was 161. Test to determine if her class' mathematics comprehension is different than 164 at the 0.05 level of significance. (Show all seven steps.)

Women N Mean Standard Deviation New Drug 40 38.88 3.97 Placebo 41 39.24 4.21 Men N Mean Standard Deviation New Drug 10 45.25 1.89 Placebo 9 39.06 2.22 There is no statistical difference between the new drug and the placebo in women. Is there a significant difference between the placebo and the new drug among men in this study? The pooled standard deviation is equal to 2.05. Please complete the 5 steps of hypothesis testing. Remember that the n of both groups is less than 30.